The invention discloses a thin-specification weathering steel with the yield strength greater than or equal to 550 MPa produced by adopting a short process and a method. The weathering steel is composed of, by weight, 0.030-0.065 % of C, 0.10-0.30% of Si, 0.7-1.3% of Mn, 0.10-0.40 of Cu, 0.20-0.55% of Cr, 0.15-0.40% of Ni, 0.06-0.10% of Ti, 0.02-0.06% of Nb, 0.01-0.06% of Als, less than or equal to 0.020% of P, less than equal to 0.008% of S and less than or equal to 0.008% of N; the production method comprises the steps that continuous casting is carried out to form a thin slab after conventional smelting; the thin slab is heated; two times of descaling are carried out; seven times of finish rolling are carried out; laminar flow cooling is carried out to a reeling temperature; coiling iscarried out; and leveling is carried out. According to the preparation method, the full-length thickness of the strip steel is uniform, the plate shape and the rolling shape are excellent, the rollingprocess is stable, the yield of the original variety is increased to 90% or above, the purpose of replacing cold rolled products in batches is achieved, and the requirement of light weight of the container is met.